Fix issues with using obsolette API

[axxie]

When opening the app the toast appears for a short time. It states there are some compatibility issues.
In addition in logcat the are errors like these:

Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
Accessing hidden method Landroid/os/Trace;->isTagEnabled(J)Z (greylist, reflection, allowed)
Accessing hidden method Landroid/os/Trace;->traceBegin(JLjava/lang/String;)V (greylist, reflection, allowed)
Accessing hidden method Landroid/os/Trace;->traceEnd(J)V (greylist, reflection, allowed)
Accessing hidden method Landroid/os/Trace;->asyncTraceBegin(JLjava/lang/String;I)V (greylist, reflection, allowed)
Accessing hidden method Landroid/os/Trace;->asyncTraceEnd(JLjava/lang/String;I)V (greylist, reflection, allowed)
Accessing hidden method Landroid/media/AudioManager;->getOutputLatency(I)I (greylist, reflection, allowed)